Another charging question

Electrical issues
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superp
Posts: 16
Joined: Mon Apr 25, 2011 2:52 pm
Bikes: 64FL, with shovel heads
Location: Michigan

Another charging question

#1

Post by superp » Fri Aug 12, 2011 4:34 pm

Hey guys, I have been reading about other folk's charging issues but haven't found an answer for mine. My brand new battery will test at 12.8 as it sits.
When I test the Voltage output at the battery with the bike running, I am getting 12.5-12.6. It does not change when I rev up the bike. I also tested it at the regulator output wire, same thing. When I get home today I will disconnect the regulator and test the gennie. I got back from a 3 hr ride last weekend and the battery was at 10.8....slow draw. Lucky I made it home.
What would make it put out only 12.5 CONSTANT volts? I figured if the regulator was bad it would be very low, nothing, or spiked?



superp
Posts: 16
Joined: Mon Apr 25, 2011 2:52 pm
Bikes: 64FL, with shovel heads
Location: Michigan

Re: Another charging question

#2

Post by superp » Sat Aug 13, 2011 9:42 pm

Ok, so I disconnected the regulator. Connected the volt meter to the A post and a ground. It read -1.5 to -1.6 revved up, -.99 at idle. I polarized the gennie, same reading. Then I grounded the Field coil to get the max output reading and got -0.15. Now for some reason my voltmeter always reads negatives, but I don't know what the readings are telling me. Is the generator bad or is something else happening?

john HD
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Re: Another charging question

#3

Post by john HD » Sat Aug 13, 2011 10:15 pm

yup it needs to come out and get serviced.

the best test is to see if the headlight gets brighter when you rev it up!

john

superp
Posts: 16
Joined: Mon Apr 25, 2011 2:52 pm
Bikes: 64FL, with shovel heads
Location: Michigan

Re: Another charging question

#4

Post by superp » Mon Aug 15, 2011 1:39 am

I took the generator off and will take it to someone for tests. It appears OK, not excessively dirty or greasy. All of my charge system components are about 18 months old. None of it makes sense to me.

steve_wood
Posts: 947
Joined: Tue Jan 08, 2008 12:32 am
Bikes: 56 FLH, 2007 FLHRCI
Location: Belleville, Ontario, Canada

Re: Another charging question

#5

Post by steve_wood » Mon Aug 15, 2011 5:32 pm

You'll need to find somebody with a growler to check for shorts.

Cotten: Show 'em a picture of your growler!

superp
Posts: 16
Joined: Mon Apr 25, 2011 2:52 pm
Bikes: 64FL, with shovel heads
Location: Michigan

Re: Another charging question

#6

Post by superp » Mon Aug 15, 2011 6:02 pm

OK, so I ran out of contacts to find someone with a growler. I will bench test it tonight, maybe make a growler by holding it against the bench grinder wire wheel.

Cotten
Posts: 6911
Joined: Mon Aug 26, 2002 9:09 am
Location: Central Illinois

Re: Another charging question

#7

Post by Cotten » Mon Aug 15, 2011 6:31 pm

steve_wood wrote:You'll need to find somebody with a growler to check for shorts.

Cotten: Show 'em a picture of your growler!
Steve!

Which one?
GRWLRS.jpg
My most important and beloved growler is off to her day job, supporting me.
ajean49.jpg
Folks, the Service Manual has excellent pics and directions for its use.
SuperP!
A growler only inspect the armature, removed from the rest of the assembly. Testing the assembly is a different procedure, also explicit in the Service Manual.

....Cotten
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superp
Posts: 16
Joined: Mon Apr 25, 2011 2:52 pm
Bikes: 64FL, with shovel heads
Location: Michigan

Re: Another charging question

#8

Post by superp » Mon Aug 15, 2011 6:48 pm

Cotten wrote:SuperP!
A growler only inspect the armature, removed from the rest of the assembly. Testing the assembly is a different procedure, also explicit in the Service Manual.

....Cotten

Got it, thanks. Will continue mission...

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